SB20260918364 - Race condition in Linux kernel xen xenbus driver
Published: September 18, 2026
Security Bulletin ID
SB20260918364
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Race condition (CVE-ID: CVE-2026-90310)
CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a race condition in the xenbus_dev_changed() handling of otherend_id when a xenstore watch is processed concurrently with initial device probing. A local user can trigger concurrent xenstore watch processing during device initialization to cause a denial of service.
Remediation
Install update from vendor's website.